Marshall -- U.S. County in Kentucky Population (2000): 30125 Housing Units (2000): 14730 Land area (2000): 304.885088 sq. miles (789.648719 sq. km) Water area (2000): 35.434175 sq. miles (91.774088 sq. km) Total area (2000): 340.319263 sq. miles (881.422807 sq. km) Located within: Kentucky (KY), FIPS 21 Location: 36.901582 N, 88.322058 W Headwords: Marshall Marshall, KY Marshall County Marshall County, KY